LIST OF PLATES

PLATE PHOTO
XI. 16. ALLOY NO. 5—PEARLITE GRAINS . . .
'•17. THE STRUCTURE OF PEARLITE
XII. 18. ALLOY NO. I—PEARLITE GRAINS
ig. ALLOY NO. 8---PEARLITE GRAINS
XIII. 20. ALLOY NO. 8—6) = 78°—PEARLITE . .
XIV. 21. ALLOY NO. 8----<o — 8o°—PEARLITE .
22. ALLOY NO. I—ca = 83°—PEARLITE .
XV. 23. ALLOY NO. 8—CO = 82°—STEPS OF PEARLITE
XVI. 24. ALLOY NO. 21—o> = 86°—PEARLITE
25. ALLOY NO. 21—co = 86°—PEARLITE .
XVII. 26. ALLOY NO. 8—C = O' 55%—BEAMS OF
CEMENTITE ROUND A PEARLITE ISLET
27. ALLOY NO. 8—VARIOUS PHASES OF SPHERODI-
SATION OF CEMENTITE IN HYPO-EUTECTOID
STEEL ......
XVIII. 28. ALLOY NO. I—THE SPHERODISATION PROCESS.
CRACKS ON A CEMENTITE NEEDLE
XIX. 29. DAMASCENE BLADE—C.= I'6o%
30. VARIOUS PHASES OF THE SPHERODISATION
PROCESS ......
XX. 31. SAME—FURTHER STAGES ....
32. DITTO .......
XXI. 33. DAMASCENE BLADE NO. I FROM D. K. TSCHER-
NOFF'S COLLECTION ....
34. DAMASCENE BLADE NO. 1434 FROM THE
WALLACE COLLECTION ....